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  2. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The most famous example of a timekeeping device during the medieval period was a clock designed and built by the clockmaker Henry de Vick in c.1360, [88] [101] which was said to have varied by up to two hours a day.

  3. Canonical hours - Wikipedia

    en.wikipedia.org/wiki/Canonical_hours

    In the practice of Christianity, canonical hours mark the divisions of the day in terms of fixed times of prayer at regular intervals. A book of hours, chiefly a breviary, normally contains a version of, or selection from, such prayers. [1][2] In the Roman Rite of the Catholic Church, canonical hours are also called officium, since it refers to ...

  4. 12-hour clock - Wikipedia

    en.wikipedia.org/wiki/12-hour_clock

    The 12-hour clock is a time convention in which the 24 hours of the day are divided into two periods: a.m. (from Latin ante meridiem, translating to "before midday") and p.m. (from Latin post meridiem, translating to "after midday").

  5. Book of hours - Wikipedia

    en.wikipedia.org/wiki/Book_of_Hours

    The Hours of Mary of Burgundy (facsimile edition). Harvey Miller, 1995. ISBN 1-872501-87-7; Barstow, Kurt. The Gualenghi-d'Este Hours: Art and Devotion in Renaissance Ferrara. Los Angeles: Getty Publications, 2000. ISBN 978-0-89236-370-4; Clark, Gregory T. The Spitz Master: A Parisian Book of Hours. Los Angeles: Getty Publications, 2003. ISBN ...

  6. Hour - Wikipedia

    en.wikipedia.org/wiki/Hour

    Midnight to 1 a.m. on a 24-hour clock with a digital face. An hour (symbol: h; [1] also abbreviated hr) is a unit of time historically reckoned as 1⁄24 of a day and defined contemporarily as exactly 3,600 seconds (SI). There are 60 minutes in an hour, and 24 hours in a day.

  7. Church bell - Wikipedia

    en.wikipedia.org/wiki/Church_bell

    The Angelus, depicting prayer at the sound of the bell (in the steeple on the horizon) ringing a canonical hour.. Oriental Orthodox Christians, such as Copts and Indians, use a breviary such as the Agpeya and Shehimo to pray the canonical hours seven times a day while facing in the eastward direction; church bells are tolled, especially in monasteries, to mark these seven fixed prayer times.

  8. Moment (unit) - Wikipedia

    en.wikipedia.org/wiki/Moment_(unit)

    A moment (momentum) is a medieval unit of time. The movement of a shadow on a sundial covered 40 moments in a solar hour, a twelfth of the period between sunrise and sunset. The length of a solar hour depended on the length of the day, which, in turn, varied with the season. [1] Although the length of a moment in modern seconds was therefore ...

  9. Très Riches Heures du Duc de Berry - Wikipedia

    en.wikipedia.org/wiki/Très_Riches_Heures_du_Duc...

    The Très Riches Heures du Duc de Berry (French pronunciation: [tʁɛ ʁiʃz‿œʁ dy dyk də beʁi]; English: The Very Rich Hours of the Duke of Berry[1]), or Très Riches Heures, is an illuminated manuscript that was created between c. 1412 and 1416. It is considered a book of hours, which is a type of Christian devotional book or a ...